1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2019 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_btree.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_mount.h"
14 #include "xfs_health.h"
15 #include "scrub/scrub.h"
16 #include "scrub/health.h"
19 * Scrub and In-Core Filesystem Health Assessments
20 * ===============================================
22 * Online scrub and repair have the time and the ability to perform stronger
23 * checks than we can do from the metadata verifiers, because they can
24 * cross-reference records between data structures. Therefore, scrub is in a
25 * good position to update the online filesystem health assessments to reflect
26 * the good/bad state of the data structure.
28 * We therefore extend scrub in the following ways to achieve this:
30 * 1. Create a "sick_mask" field in the scrub context. When we're setting up a
31 * scrub call, set this to the default XFS_SICK_* flag(s) for the selected
32 * scrub type (call it A). Scrub and repair functions can override the default
33 * sick_mask value if they choose.
35 * 2. If the scrubber returns a runtime error code, we exit making no changes
36 * to the incore sick state.
38 * 3. If the scrubber finds that A is clean, use sick_mask to clear the incore
39 * sick flags before exiting.
41 * 4. If the scrubber finds that A is corrupt, use sick_mask to set the incore
42 * sick flags. If the user didn't want to repair then we exit, leaving the
43 * metadata structure unfixed and the sick flag set.
45 * 5. Now we know that A is corrupt and the user wants to repair, so run the
46 * repairer. If the repairer returns an error code, we exit with that error
47 * code, having made no further changes to the incore sick state.
49 * 6. If repair rebuilds A correctly and the subsequent re-scrub of A is clean,
50 * use sick_mask to clear the incore sick flags. This should have the effect
51 * that A is no longer marked sick.
53 * 7. If repair rebuilds A incorrectly, the re-scrub will find it corrupt and
54 * use sick_mask to set the incore sick flags. This should have no externally
55 * visible effect since we already set them in step (4).
57 * There are some complications to this story, however. For certain types of
58 * complementary metadata indices (e.g. inobt/finobt), it is easier to rebuild
59 * both structures at the same time. The following principles apply to this
60 * type of repair strategy:
62 * 8. Any repair function that rebuilds multiple structures should update
63 * sick_mask_visible to reflect whatever other structures are rebuilt, and
64 * verify that all the rebuilt structures can pass a scrub check. The outcomes
65 * of 5-7 still apply, but with a sick_mask that covers everything being
69 /* Map our scrub type to a sick mask and a set of health update functions. */
71 enum xchk_health_group {
78 struct xchk_health_map {
79 enum xchk_health_group group;
80 unsigned int sick_mask;
83 static const struct xchk_health_map type_to_health_flag[XFS_SCRUB_TYPE_NR] = {
84 [XFS_SCRUB_TYPE_SB] = { XHG_AG, XFS_SICK_AG_SB },
85 [XFS_SCRUB_TYPE_AGF] = { XHG_AG, XFS_SICK_AG_AGF },
86 [XFS_SCRUB_TYPE_AGFL] = { XHG_AG, XFS_SICK_AG_AGFL },
87 [XFS_SCRUB_TYPE_AGI] = { XHG_AG, XFS_SICK_AG_AGI },
88 [XFS_SCRUB_TYPE_BNOBT] = { XHG_AG, XFS_SICK_AG_BNOBT },
89 [XFS_SCRUB_TYPE_CNTBT] = { XHG_AG, XFS_SICK_AG_CNTBT },
90 [XFS_SCRUB_TYPE_INOBT] = { XHG_AG, XFS_SICK_AG_INOBT },
91 [XFS_SCRUB_TYPE_FINOBT] = { XHG_AG, XFS_SICK_AG_FINOBT },
92 [XFS_SCRUB_TYPE_RMAPBT] = { XHG_AG, XFS_SICK_AG_RMAPBT },
93 [XFS_SCRUB_TYPE_REFCNTBT] = { XHG_AG, XFS_SICK_AG_REFCNTBT },
94 [XFS_SCRUB_TYPE_INODE] = { XHG_INO, XFS_SICK_INO_CORE },
95 [XFS_SCRUB_TYPE_BMBTD] = { XHG_INO, XFS_SICK_INO_BMBTD },
96 [XFS_SCRUB_TYPE_BMBTA] = { XHG_INO, XFS_SICK_INO_BMBTA },
97 [XFS_SCRUB_TYPE_BMBTC] = { XHG_INO, XFS_SICK_INO_BMBTC },
98 [XFS_SCRUB_TYPE_DIR] = { XHG_INO, XFS_SICK_INO_DIR },
99 [XFS_SCRUB_TYPE_XATTR] = { XHG_INO, XFS_SICK_INO_XATTR },
100 [XFS_SCRUB_TYPE_SYMLINK] = { XHG_INO, XFS_SICK_INO_SYMLINK },
101 [XFS_SCRUB_TYPE_PARENT] = { XHG_INO, XFS_SICK_INO_PARENT },
102 [XFS_SCRUB_TYPE_RTBITMAP] = { XHG_RT, XFS_SICK_RT_BITMAP },
103 [XFS_SCRUB_TYPE_RTSUM] = { XHG_RT, XFS_SICK_RT_SUMMARY },
104 [XFS_SCRUB_TYPE_UQUOTA] = { XHG_FS, XFS_SICK_FS_UQUOTA },
105 [XFS_SCRUB_TYPE_GQUOTA] = { XHG_FS, XFS_SICK_FS_GQUOTA },
106 [XFS_SCRUB_TYPE_PQUOTA] = { XHG_FS, XFS_SICK_FS_PQUOTA },
107 [XFS_SCRUB_TYPE_FSCOUNTERS] = { XHG_FS, XFS_SICK_FS_COUNTERS },
110 /* Return the health status mask for this scrub type. */
112 xchk_health_mask_for_scrub_type(
115 return type_to_health_flag[scrub_type].sick_mask;
119 * Update filesystem health assessments based on what we found and did.
121 * If the scrubber finds errors, we mark sick whatever's mentioned in
122 * sick_mask, no matter whether this is a first scan or an
123 * evaluation of repair effectiveness.
125 * Otherwise, no direct corruption was found, so mark whatever's in
126 * sick_mask as healthy.
130 struct xfs_scrub *sc)
132 struct xfs_perag *pag;
138 bad = (sc->sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
139 XFS_SCRUB_OFLAG_XCORRUPT));
140 switch (type_to_health_flag[sc->sm->sm_type].group) {
142 pag = xfs_perag_get(sc->mp, sc->sm->sm_agno);
144 xfs_ag_mark_sick(pag, sc->sick_mask);
146 xfs_ag_mark_healthy(pag, sc->sick_mask);
153 xfs_inode_mark_sick(sc->ip, sc->sick_mask);
155 xfs_inode_mark_healthy(sc->ip, sc->sick_mask);
159 xfs_fs_mark_sick(sc->mp, sc->sick_mask);
161 xfs_fs_mark_healthy(sc->mp, sc->sick_mask);
165 xfs_rt_mark_sick(sc->mp, sc->sick_mask);
167 xfs_rt_mark_healthy(sc->mp, sc->sick_mask);
175 /* Is the given per-AG btree healthy enough for scanning? */
177 xchk_ag_btree_healthy_enough(
178 struct xfs_scrub *sc,
179 struct xfs_perag *pag,
182 unsigned int mask = 0;
185 * We always want the cursor if it's the same type as whatever we're
186 * scrubbing, even if we already know the structure is corrupt.
188 * Otherwise, we're only interested in the btree for cross-referencing.
189 * If we know the btree is bad then don't bother, just set XFAIL.
193 if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
195 mask = XFS_SICK_AG_BNOBT;
198 if (sc->sm->sm_type == XFS_SCRUB_TYPE_CNTBT)
200 mask = XFS_SICK_AG_CNTBT;
203 if (sc->sm->sm_type == XFS_SCRUB_TYPE_INOBT)
205 mask = XFS_SICK_AG_INOBT;
208 if (sc->sm->sm_type == XFS_SCRUB_TYPE_FINOBT)
210 mask = XFS_SICK_AG_FINOBT;
213 if (sc->sm->sm_type == XFS_SCRUB_TYPE_RMAPBT)
215 mask = XFS_SICK_AG_RMAPBT;
218 if (sc->sm->sm_type == XFS_SCRUB_TYPE_REFCNTBT)
220 mask = XFS_SICK_AG_REFCNTBT;
227 if (xfs_ag_has_sickness(pag, mask)) {
228 sc->sm->sm_flags |= XFS_SCRUB_OFLAG_XFAIL;